Fig. 2: Effects of Trichoderma filtrate on the iron mobilization of the Syncom under iron-limited conditions with microtiter plate.

Trichoderma iron-limited filtrate effects on iron-mobilization ability in microtiter plate experiment (A). Effects of Trichoderma iron-limited filtrate on siderophore production (B) and pH (C) of SynCom. Principal component analysis (PCA) for 18 organic acids under different inoculation treatments in microtiter plate experiment (D). The solid line shows there are significant differences between SynCom and Tf+SynCom. Effect of Trichoderma iron-limited filtrate on oxalic acid (E) and α-ketoglutaric acid (F) of SynCom. The inoculation treatments used in the study included Tf, SynCom, and Tf+SynCom. Different lowercase letters above each bar represent significant differences based on analysis of variance (ANOVA) followed by Tukey’s HSD test (P < 0.05).